Top roll



Sept. 16, 1941.

L, D. COBB 2,256,193

TOP ROLL Filed Aug. 10, 1939 2 Sheets-Sheet 2 I INVENTOR: LELAND 0.c055,

F DW

' HIS/ITTORNEY.

Patented Sept. 16, 1941 TOP ROLL Leland n. Cobb, Forestville, Conm,asslgnor to General Motors Corporation, Detroit, Mich, a

corporation of Delaware k 11 Claims,

This invention relates to top rolls for spinning frames, drawing framesand other like machinery wherein a thread of yarnis stretched andreduced in size bypassing it between top and bottom rolls that are urgedinto rolling contact.

' One. object of this inventiorris to provide an improved top rollofsimple construction that has easily demou'ntable interchangeable rollmembers. Another object isv to provide a top roll wherein the rollmembers are supported by a single antifriction bearing so constructedthat Application flugust 10, 1939, Serial No. 289,332

lubricant cannot escape from the bearing onto the v work engagingsurfaces of the rolls.

To these ends, and also to improve generally upon devices of thecharacter indicated, the invention consists in the various mattershereinafter described and claimed.

In the accompanying drawings: Figure l is a perspective view showing anapplication of this'invention;

of the top roll members It and the similarly positioned bottom rollmembers R. The antifriction bearing is so constructed that'iubricantcannotescape therefrom and onto the yarn engaging faces of the top andthe bottom rolls or into the guides G where it would rapidly collect lmtand interfere with the top roll operation.

Referring in detail to the embodiment shown in the Figures-1 and 2 ofthe drawings, the shaft H. which forms the inner race member of theantifriction bearing [4, has the spaced'raceways I in which roll theballs I'I that are also in rolling engagement with the inner cylindricalwall I! of. the annular outer race member I8 Figure 2 is a longitudinalsection through the top roll.

Figure 3 is a perspective view showing the oil hole closure member;

Figure 4 is a fragmentary view partly in longitudinal diametricalsection through a roll hub;

Figure 5 is an end view of the roll hub;

Figure 6 is a longitudinal section through another embodiment of my toproll;

Figure 7 is a longitudinal section through an-v other embodiment of myinvention;

Figure 8 is an enlarged sectional view of a diflferent roll member;

' Figure 9 is a fragmentary longitudinal section showing anotherembodiment of my invention;

Figure 10 is a fragmentary sectional view showing the structure fordemountably securing the roll member of Figure 9 in position; and

Figure 11 is an enlarged cross section taken along the line lI-l| ofFigure 10 and looking in the direction of the arrows.

Generally stated, in the embodiments here illustrated, a top roll unit,as '1, has quickly and easily demountable, interchangeable roll members,as Ill, spaced on a shaft, as H, rotatable in the end caps, as II, thatnon-rotatably engage and vertically slide in the slotted guides G whichprevent skewing of the top roll T with respect to a drivernbottom roll 3with which the top roll '1 is normally urged into rolling engagement. Anantifriction bearing, as It, located on the shaft ll between the rollmembers it, is engaged under suitable yieldable pressure by an arm P sothat a uniform controlled pressure may be applied that has the spacedperipherally disposed ribs 20 at each side of the pressure arm P. A pairof similar stepped sleeves 22 surround the shaft i I in closely spacedrelation to the shaft and have their opposed, reduced inner ends 23pressed into the outer ends of the race ring I! with their intermediatelocating shoulders 24 abutted against the ends of the race ring it andtheir inner end faces 25 adjacent to the balls II. This constructionprovides a simple and efficient unit-handling shaft and bearingstructure wherein the sleeves 22 effectively close the ends of the ballchamber 26 which may be chargedwith a suitable lubricant through one ofthe oil holes 21 that extend through the member It between the ballraces. A resilient c-shaped closure member 28, slidably fitted in theperipheral groove .30 in the outer race ring it, maybe turned to provideconvenient access to one of the oil holes 21, and the member 28 has apair of inwardly directed depressed portions 3| arranged to slidablysnap into seated sealing engagement with these holes 21.

The sleeves 22 are preferably composed of any suitable lubricantimpregnated material, such, for example, as a molded fibrous materialcommonly known under the trade name of Textolite and impregnated withgraphite. For clarity of illustration, the annular space between thesleeves 22 and the shaft is exaggerated, but this spacing issufficiently small to normally preclude lubricant leakage therethrough.In the event that the antifriction bearing should break due to lack oflubrication, the sleeves 22 would act in the capacity of well lubricatedplain bearings so that the shaft II and the rolls It would continue tofreely turn until the antifriction hearing could be repaired.

The interchangeable roll members Ill have annular hubs 35 upon which aresecured the replaceable tubular cots 38 that may be composed to thethread or yarn Y that is fed between each of rubber, leather, cork orother suitably yieldable material. I preferably removably secure thehubs "to-the shaft II at each sideof the hearing ll so that these hubsmay'turn as a unit with the shaft. Abore 33 that axially ex- ,tends'through each hub 35, slidably receives the shaft II, and the inner andoutside ends of this bottom of the counterbore 42 by an annular wall 46through which the keyway passes. -A

portion of the wall 46 is struck into thegroove at 48 and a locatingpin- 58, pressed into'a transverse bore in the shaft II, has a head 52extending from the shaft and receivable in the groove 45 to axiallyposition the roll member I8.

To demuuntably assemble the rolls on the shaft II, each hub 35 isslidover the shaft with the keyway 44 receiving the head 52, and when thishead is received withinthe groove 45. the roll is turned on the shaftuntil the head enters into wedged driven engagement with the struck-inportion 48. It will be appreciated that if it is .desired to permitrelative rotation of the roll members I8 on the be used.-

The end caps I2, which are generally cupshaped to rotatably receive theends of the shafts shaft I I, the pins 58 need not 4 II, are preferablycomposed of a suitable, lubricant impregnated material, such asTextoli-te,

' and a C-shaped snap ring 54 removably engages within a ring groove 55in the shaft and in an annular groove 56 in the end cap I2. One of theends of the snap ring 54 is preferably v straightened so that the ringwill resiliently engage the groove 56 and stay in this groove 56 whenthe cap is pulled off of the shaft II. The outer end of the cap I2 isenlarged and shaped as a polygon having the parallel opposed faces 5.!that slidably engage the side walls of the guides G. With thisconstruction, in the event that two of the faces 51 become worn, the capI2 may be lifted from its seated position and turned to locate two otherfaces in slidable engagement in the guide G. I t

Figure 6 shows another embodiment of my invention wherein theantifriction bearing of Figure 2 is replaced by a generally similarbearing construction which has only a single row of balls 68 rolling ina substantially centrally disposed raceway of the shaft 6 I and in anouter race ring 62 that receives the pressure arm P between the endflanges 63. The stepped sleeves 64 composed of a suitable lubricantimpregnated material and generally similar to the sleeves 22 of Figure1, close the ends of the bearing and surround the shaft 6| in closelyspaced relation. The rolls 65 are provided with the usual tubular cots66 mounted on the annular hubs 61 that are removably journalled on theshaft 6I at each side of the antifriction bearing, and these rolls,which are interchangeable and reversible, have the similar endcounterbores 18 that respectively receive the inner ends of the end caps'II and the ends of. the sleeves '64. The end caps II, which may becomposed. of a suitable lubricant impregnated material as Textolite, arerespectively journalled throughout their lengths on the ends of theshaft 6I and have the flat faces 13 for engagement with a side face ofeach guide G to bearing upon the outer race ring 9I freely slidable inthe guides G. Each cap is removably held on the shaft end by a stud 14provided with a head that overlies the end of the cap II, and a splitpost 15 on the stud extends into frictional engagement 'within an endbore .16 in the shaft 8|.

Figure! shows a slightly different embodiment herein my top rollconstruction differs only from the structure of Figure 6 in that thecentral antifriction bearing 88 is of the so-called "*needle type." Inthis structure, a large number of cylindrical rollers 8|, which are of avery small diameter as compared to their lengths,.are

in freely rolling contact with the shaft 82 and with a tubular casing 83upon which the outer race sleeve 84 is mounted. The ends of the casing83 are curled over at 85 .to axially restrict the rollers 8|, and thesewhere are preferably provided with tapered ends to reduce their endfrictional engagement with the casing. The sleeve 84 is flanged at itsends and the pressure arm P is received between these flanges.

Figure 8 shows a different roll member 81 which may replace the rollmember 65. In this construction the roll 81 is shaped generally similarto the combined hub 61 and c'ot 66 but is entirely composed of ayieldable material such as cork, rubber or other suitable material thatwill meet the requirements of the cot 66'. If desired, the interior ofthe roll member 81 may be coated with a phenolic condensation product,such as Bakelite, or a similar material; which will strengthen'themember and aid its bearing properties on the shaft.

.Figures 9, 10 and 11 illustrateanother embodi be generally similar tothat disclosed in the United States patent to Large, No. 1,917,988-andissued on July 11, 1933, has the pressure arm P top roll unit into thedesired position. A pair of interchangeable roll members 92, providedwith the usual yieldable tubular cots 93 are axially bored at 94 todemountably and respectively fit over the shaft 98 at each side of thebearing 89.

A pair of loking' sleeves 95, respectively pressed over the shaft 98indriving engagement therewith at each side of the bearing 89, are eachprovided with an annular eccentric dovetailed portion 96 that ismatingly received in demountable interlocking engagement within agenerally similarly shaped eccentric annular recess 91 at the inner endof each roll member 92. Each recess 91 is of a sufliciently large sizeso that the dovetailed portion 96 may be entered therein when theeccentric mating portions 96 and 91 are coaxially aligned, and arelative turning of these interfitted parts enters them into a tightlywedged interlocked relation wherein the roll members 92 areconstrainedto turn as a unit with the shaft nailed on the shaft ends,extend prevent rotationof these caps 'II while they are to urge .the

and rolls demountably secured of a suitable lubricant impregnated moldedmaterial, such as Textolite.

I claim:

1. In a top roll for textile machinery, a shaft, an antifriction bearingarranged to be handled as a unit with the shaft, roll members removablymounted on the shaft at each side of the bearing, and end capsdemountably locked in journalled engagement with the ends of said shaftwhich project out of said rolls.

2. In a top roll for textile machinery, a pair of spaced rolls, a shaftaxially extending completely through the rolls, means demountablylocking said rolls against relative rotation and in predeterminedpositions on said shaft, an antifrictlon bearing arranged to be handledas a unit with the shaft between said rolls, and end caps demountablylocked in respectively rotatable engagement with the ends of said shaft.

3. In a top roll for textile machinery, an antifriction bearingcomprising an outer race ring, an inner race member extending throughsaid outer race ring, rolling elements between said rings, and rollmembers removably mounted on said inner race-member at each side of theouter race ring.

4. In a top roll for textile machinery, an outer race member, an innerrace member extending therethrough, rolling elements in rotatableengagement with said members. and lubricant impregnated sleevesrespectively carried by the ends of the outer race ring and in closelyspaced sur- 7. In a top roll for textile machinery, an outer race ring,projections on the ring for locating jecting therefrom, rolling elementsbetween and in rotatable engagement with said race members, and anon-metallic lubricant impregnated sleeve pressed into each end of theouter race member L adjacent said rolling elements, the sleeve closelysurrounding the inner race member and providing an emergency bearing inthe event of breakage of said rolling elements.

9. In a top roll for textile machinery, a shaft, a pin laterallyprotruding from the shaft, a roll member demountable on the shaft andhaving a keyway and an annular groove for receiving said protrudingportion of the pin, and an an rounding relation to,v said inner racemember,

on the ends of'the shaft and extending nular wall in the roll at oneside of said groove and having a portion bent into the groove for wedgedengagement with the pin, whereby the roll is removably locked inshaft-driving relation.

10. In atop roll for textile machinery, a'pair of spaced rolls, a shaftextending therethrough,

- race ring, ashaft extending therethrough and assembled for handling asa unit.

6. In a top roll for textile machinery, an outer racering, a shaftextending therethrough and having a peripheral ball, groove, balls inthe groove and rotatably engaging the race ring and said shaft, steppedlubricant impregnated sleeves pressed into the ends of the outer: racering and in closely spaced annular relation to the shaft. on the shaftat each end of said outer race ring. 4

having a pair of spaced ball grooves, rows of balls in said grooves andin rolling engagement with said race ring, sleeve members substantiallyclosing the space between the outer ends'of the race l LELAND D. COBB.

